The Harmandir Sahib literally means The Temple of God. The fourth guru of Sikhism, Guru Ram Das, excavated a tank in 1577 CE which subsequently became known as Amritsar (meaning "Pool of the Nectar of Immortality"),[8] giving its name to the city that grew around it. In due course, a Sikh edifice, Sri Harmandir Sahib (meaning "the abode of God"),[9] rose in the middle of this tank and became the supreme centre of Sikhism. Its sanctum came to house the Adi Granth comprising compositions of Sikh Gurus and other saints considered to have Sikh values and philosophies